Which of the following statements are correct about herbarium?
- AIt is a store house of collected plant specimens that are dried and preserved on sheets.
- BHerbarium sheets contain information about date and place of collection,names,family,collector's name,etc.
- CIt serves as quick referral systems in taxonomical studies.
- DAll of the above
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Two soap bubbles of radii $r_1 = 4 \, cm$ and $r_2 = 5 \, cm$ are touching each other over a common surface $S_1S_2$ (as shown in the figure). The radius of curvature of this common surface will be ....... $cm$.
The number of unpaired electrons in $Zn^{2+}$ is
Which of the following tissues is present in the leaves of $Pinus$ and serves to conduct water and food?
If $a = \frac{1-i \sqrt{3}}{2}$,then the correct matching of List-$I$ with List-$II$ is:
List-$I$ List-$II$ $(i) \ a \bar{a}$ $(A) -\frac{\pi}{3}$ $(ii) \ \arg \left(\frac{1}{\bar{a}}\right)$ $(B) -i \sqrt{3}$ $(iii) \ a-\bar{a}$ $(C) \frac{2i}{\sqrt{3}}$ $(iv) \ \operatorname{Im}\left(\frac{4}{3a}\right)$ $(D) 1$ $(E) \frac{\pi}{3}$ $(F) \frac{2}{\sqrt{3}}$
| List-$I$ | List-$II$ |
| $(i) \ a \bar{a}$ | $(A) -\frac{\pi}{3}$ |
| $(ii) \ \arg \left(\frac{1}{\bar{a}}\right)$ | $(B) -i \sqrt{3}$ |
| $(iii) \ a-\bar{a}$ | $(C) \frac{2i}{\sqrt{3}}$ |
| $(iv) \ \operatorname{Im}\left(\frac{4}{3a}\right)$ | $(D) 1$ |
| $(E) \frac{\pi}{3}$ | |
| $(F) \frac{2}{\sqrt{3}}$ |
If $S_n = 1^3 + 2^3 + \ldots + n^3$ and $T_n = 1 + 2 + \ldots + n$,then
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